diff --git a/dlls/riched20/paint.c b/dlls/riched20/paint.c
index df2eda84d3d..88576f620c4 100644
--- a/dlls/riched20/paint.c
+++ b/dlls/riched20/paint.c
@@ -288,7 +288,7 @@ static void ME_DrawRun(ME_Context *c, int x, int y, ME_DisplayItem *rundi, ME_Pa
     }
 }
 
-static struct {unsigned width_num : 4, width_den : 4, pen_style : 4, dble : 1;} border_details[] = {
+static const struct {unsigned width_num : 4, width_den : 4, pen_style : 4, dble : 1;} border_details[] = {
   /* none */            {0, 1, PS_SOLID, FALSE},
   /* 3/4 */             {3, 4, PS_SOLID, FALSE},
   /* 1 1/2 */           {3, 2, PS_SOLID, FALSE},
@@ -303,7 +303,7 @@ static struct {unsigned width_num : 4, width_den : 4, pen_style : 4, dble : 1;}
   /* 1 1/2 dashed */    {3, 2, PS_DASH, FALSE},
 };
 
-static COLORREF         pen_colors[16] = {
+static const COLORREF pen_colors[16] = {
   /* Black */           RGB(0x00, 0x00, 0x00),  /* Blue */            RGB(0x00, 0x00, 0xFF),
   /* Cyan */            RGB(0x00, 0xFF, 0xFF),  /* Green */           RGB(0x00, 0xFF, 0x00),
   /* Magenta */         RGB(0xFF, 0x00, 0xFF),  /* Red */             RGB(0xFF, 0x00, 0x00),